Handlebars Util

backend/src/utils/handlebars.ts

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+import Handlebars from "handlebars";
+
+const createDocumentTemplateHandlebars = () => {
+    const instance = Handlebars.create();
+
+    instance.registerHelper("eq", (left, right) => left === right);
+    instance.registerHelper("ne", (left, right) => left !== right);
+    instance.registerHelper("gt", (left, right) => left > right);
+    instance.registerHelper("gte", (left, right) => left >= right);
+    instance.registerHelper("lt", (left, right) => left < right);
+    instance.registerHelper("lte", (left, right) => left <= right);
+    instance.registerHelper("and", (...args) => args.slice(0, -1).every(Boolean));
+    instance.registerHelper("or", (...args) => args.slice(0, -1).some(Boolean));
+    instance.registerHelper("not", (value) => !value);
+    instance.registerHelper("includes", (collection, value) => {
+        if (Array.isArray(collection) || typeof collection === "string") {
+            return collection.includes(value);
+        }
+
+        return false;
+    });
+
+    return instance;
+};
+
+export const documentTemplateHandlebars = createDocumentTemplateHandlebars();